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Патент USA US2121171

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June 21, 1938.
Q
R LALQUX
‘
2,121,171
BARREL FASTENING MEANS
Original Filed Aug. 17, 1935
2 Sheets-Sheet l
48
49
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~ RENé
BY
\NVENTOR
LALOUX
ATTORNEY
June 21,' 1938;
R. LALOUX ,
2,121,171
BARREL FASTENING MEANS
Original Filed Aug. 1'7, 1955
2 Sheets-Sheet 2
I
WNVENTOR’
RENE LALOUX
BY
6g
ATTORNEY
Patented June 21, 1938
2,121,17i
2,121,171
'
BARREL FASTENING NEEAN S
Rene Laloux, Brussels, Belgium
Original application August 17, 1935, Serial No.
36,740. Divided and this application May 1,
1936, Serial No. 77,426. In Belgium August
21, 1934
2 Claims.
The present invention relates to the fastening
of barrels to machine guns, Lewis guns or simi
lar ?rearms for the rapid mounting and dis
mounting of the gun.
This application is a division of my copending
m
ment of the invention.
Fig. 1 is an exterior view of a machine gun
provided with a barrel fastening means accord
the ?rearm: in this system the ring with broken
threads is mounted on the frame of the ?rearm
and receives the threaded end of the barrel in
order to connect it rigidly with the frame of the
15 ?rearm.
The object of the present invention is to use
the grip of the ring with broken threads to trans
port the barrel, to put it into position on the ?re
arm and to lift it off easily.
20
The idea of providing a grip serving at the
same time for transporting the barrel and for
fastening it on the ?rearm is not new but it is
new to arrange the ring with broken threads
in such a way that the grip arranged on this
25 ring serves at the same time for the transport
and putting into position of the barrel. For
this purpose a ring, on which a grip is arranged,
is screwed onto an extension of the barrel con
taining the chamber and carries an external
3 0 broken thread engaging into a corresponding
inside thread of the breach case of the ?rearm.
According to the invention the external thread
on the ring has a pitch slightly greater than
that of the thread between the ring and the
extension of the barrel.
This fastening means
allows a very strong attachment to be obtained
even if the barrels are not strictly identical and
it consequently permits relatively large construc
tional tolerances.
'
l
L
50
an extension “la in which the chamber 53 is
provided. This barrel extension [8a is engaged
with sliding-friction into the forepart of the
breech box 23 and is provided with a screw
thread 3i on which is threadedly mounted a ring N) 0
35 provided with an external interrupted screw
thread 36 comprising two parts which are diam
etrally opposed.
In the forepart of the breech box is provided
an internal screw thread 31 which corresponds .
to the thread 36; and besides, apertures 38 diam
etrally opposed are provided in order to allow
the introduction of the screw threaded parts 36
of the ring 35.
30
In order to ?x the barrel it is necessary after
longitudinal insertion of the screw 36 into the
apertures 38, to rotate the ring 35 about a quar
ter of a turn around its axis in order to engage
the screw thread 36 into the screw thread 31 35
of the breech box.
The pitch of this external screw thread 3'6
of the ring is slightly greater than that of the
inside screw thread 34 and consequently by ro
As shown in the drawings, the ring 35 is con
nected to a handle it! by means of a rod 45
ring to push the barrel forward.
, .
In order to obtain a good guiding of the bar
rels when remounting, the frame and the bar
rel are provided with sliding plane faces serving
for facilitating the introduction of the barrel;
this frame is also provided with a fork which
El 5 surrounds the barrel towards the forward part of
15
The barrel i8 is provided at its rear part with
vided on the breech case.
tion provides on the vertical face of the frame
situated in front of the ring an abutment oper
able on at the end of the opening motion of the
»
v
Fig. 4 is a rear view of the barrel.
Fig. 5 is a front view of the breech case.
tating the ring 35 the bearing face 39 of the
barrel is strongly pressed against the correspond
ing face of the forepart of the breech box.
45 piston when dismounting the barrel, the inven
l
ing to the invention.
Fig. 2, is an enlarged view of a part of Fig. 1 10
in partial section.
Fig. 3 is an enlarged plan view of a part of
Fig. 1.
In order to prevent accidental slackening of
the barrel, the ring is provided with a spring
pressed pawl co-operating with stop notches pro
In order to facilitate the removal of the gas
11.
The annexed drawings show by way of ex
ample and in a non limiting manner an embodi
1935.
of a ring with broken threads provided with a
' 1.0 grip for connecting the barrel to the frame of
40
the gas cylinder, said fork being provided with
two ?at sides which cooperate with two lateral
?at sides belonging to the barrel.
application, Serial No. 36,740, ?led August 17,
It is already known to fasten barrels by means
' . 35
(CI. 42-75)
along which slides a spring-pressed ‘pawl 4|.
This handle serves for rotating the ring and for
the carriage either of the barrel alone or the
automatic rapid ?re gun with its barrel.
The pawl 41 has an abutment 42 cooperating
with ratchet notches or grooves 43 provided in
the lateral outside face of the breech box. These
grooves avoid the accidental unlocking of the
ring whatever the ?nal position of the abutment
42 of the pawl 4| may be.
A groove 44 is provided upon the forepart of 55
2
"2,121,171
the breech box in such a place that when the
abutment 42 is in register with this groove the
outside screw thread 36 of the ring is disengaged
from the inside screw thread. 3'1 of the breech
box, that is to say the barrel is ready for lateral
disconnection.
In order to remove the gas piston 4 when dis
mounting the barrel, a small inclined abutment
46 is provided on the forepart of the breech box
10 and the rod 45 along which slides the pawl 4!
presses against this abutment to produce the for
Ward motion of the barrel.
For facilitating the introduction of the barrel
when remounting the arm a double guide is pro
15 vided comprising lateral ?at sides 41 on the fore
part of the barrel. These flat sides frictionally
cooperate with a fork 43 provided near the end
of the gas cylinder to ensure a correct position
ing of the barrel when setting it in place in the
20 breech.
In order to obtain a correct regulation in height
of the barrel, a sliding plane face 49 is provided
towards the forepart of the gas cylinder and co
operates with a corresponding plane face of the
25 barrel; besides, towards the rear part of the bar
rel is provided another plane face 50 which slides
on the upper end of the ribs 5| which are pro
vided towards the rear part of the gas cylinder.
The invention is not limited to the embodiment
30 described by way of example, but includes all ma~
chine guns or like ?rearms which enter within the
scope of one or the other of the following claims.
What I claim is:
1. A machine gun or similar ?rearm compris
35 ing a barrel provided with an extension at the
breech end thereof, a breech casing provided with
a socket to receive said extension, said socket
having a portion of larger diameter than said
barrel extension provided with broken internal
40 screw threads, the external surface of said barrel
extension having continuous screw threads
formed thereon, a ring threadedly mounted on
said barrel extension, said ring having broken
threads on the exterior thereof adapted to coop
erate with the broken threads in said socket to
permit axial insertion of the ring in said socket
and to retain the ring therein upon relative ro
tary movement between the ring and socket, a
carrying and actuating handle on said ring, the
exterior surface of said breech casing having a
series of notches formed thereon, and a pawl
mounted. on said handle and adapted to engage
one of said notches on the exterior of the breech
1,0
casing to secure the ring in adjusted rotary posi
tions.
2. A machine gun or similar ?rearm compris
ing a barrel provided with an extension at the
breech end thereof, a breech casing provided
with a socket to receive said extension, said sock
et having a portion of larger diameter than said
barrel extension provided with broken internal 20
screw threads, the external surface of said barrel
extension having continuous screw threads
formed thereon, a ring threadedly mounted on
said barrel extension, said ring having broken
threads on theexterior thereof adapted to coop 25
erate with the broken threads in said socket to
permit axial insertion of the ring in said socket
and to retain the ring therein upon relative ro
tary movement between the ring and socket, the
broken threads of the ring and socket being of
a pitch greater than that of the continuous
thread of the barrel extension and ring, a car
rying and actuating handle on said ring, the ex
terior surface of said breech casing having a
series of notches formed thereon, and a pawl 35
mounted on said handle and adapted to engage
one of said notches on the exterior of the breech’
casing to secure the ring in adjusted rotary posi
tions.
RENE LALOUX.
40
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